In kotlin : val a = 10 val b = 10 And in java : int x = 10 int y = 10 What’s the difference?

# getting-started

[Hassaan]

In kotlin :
val a = 10
val b = 10
And in java :
int x = 10
int y = 10
What’s the difference?

[ephemient]

the only difference in this example is that val is not re-assignable

[ephemient]

while Kotlin has only a single Int type conceptually, the compiler will represent it with a boxed Integer or primitive int as appropriate, automatically

[ephemient]

this is all covered in the documentation, https://kotlinlang.org/docs/basic-types.html#numbers-representation-on-the-jvm

[Hassaan]

oh my bad , i have to type var
but here i am talking more about memory allocation

[ephemient]

there is no difference in memory allocation

[ephemient]

a <http://kotlin.Int|kotlin.Int> is never a mutable box. on JVM, it is represented by either a primitive int wherever possible, or an immutable boxed java.lang.Integer where not

[ephemient]

you should consider Int to be like other value types: they have no identity, so instances (and whether they're the same or not) aren't even part of the language model

[Hassaan]

Thanks